Pretty small cam in a 454, and ground on a 110LSA. It's probably done making power around 4500-4800rpm's.
May need more idle fuel to the mixture screws and idle bypass air.
If only one nozzle is dripping, verify the correct gasket was used between the main body and baseplate, and that one throttle plate isn't open further than the other one, twisted primary shaft, etc.....Cliff